The deep ocean floor beyond the reach of sunlight provides one of nature’s most impressive light shows.
Scientists from Harbor Branch Oceanographic Institute at Florida Atlantic University, Duke University, the Ocean Research & Conservation Association (ORCA), the Monterey Bay Aquarium Research Institute (MBARI), and Nova Southeastern University Oceanographic Center are using their combined expertise in bioluminescence, taxonomy, visual ecology, imaging and molecular biology to explore the environment of the deep-sea bottom to search for undiscovered “living lights” off the Bahamas.
This research expedition is taking place from July 20-31, 2009, and is funded by the National Oceanic and Atmospheric Administration (NOAA) Office of Ocean Exploration and Research. These scientists are using sensitive low-light cameras and Harbor Branch’s Johnson-Sea-Link submersible to photograph bioluminescence of animals in their natural environment.
“Bioluminescence is a fascinating phenomenon that is found only in a few species on land, but is common in all the world’s oceans,” said Dr. Tamara Frank, research scientist at Harbor Branch’s Center for Ocean Exploration and Deep-Sea Research and principal investigator and lead scientist on the expedition. “If you have ever seen a firefly, then you have witnessed the same process in action.”
Animals have evolved to deal with the darkness of the deep sea through the process of bioluminescence and have developed the ability to use chemicals within their bodies to produce light. Bioluminescence occurs when certain chemicals are mixed together; the effect is similar to the soft green glow produced by green light sticks when the seal in the stick is broken.
Scientists estimate that about 90 percent of the animals living in the open waters above the sea floor are bioluminescent. However, information on living light among deep-dwelling creatures is very sparse because they are so inaccessible. Furthermore, most bioluminescent animals do not glow constantly, but rather, only light up in response to mechanical or visual stimuli. They may use bioluminescence for a number of possible reasons including camouflage, attracting prey, mating and communication. Based on the few but varied deep-sea attached animals, such as corals or sea anemones, that are known to produce light, and the adaptations in the large eyes of the some of the mobile predators discovered on previous NOAA-OER funded Harbor Branch explorations, it is likely that bioluminescence is abundant and plays a significant role in animal interactions on the deep-sea floor.
“An intriguing, and as of yet unverified idea, is that when marine animals die and accumulate on the ocean floor they are covered with luminous bacteria, which unlike other bioluminescent organisms, glow continuously,” said Frank. “Bioluminescent bacteria occur throughout the marine environment, and these bacteria are known to colonize shrimp and fish carcasses, suggesting that the resulting background glow may be used as a cue by deep-sea scavengers to find carcasses.”
Previous expeditions by Frank and her colleagues have explored the vision of some of these scavengers, which are crustaceans called isopods. They have demonstrated that the isopod’s eyes work like a camera with a very slow shutter speed which makes them extremely sensitive to light. Frank and her colleagues have also discovered several species of deep-sea crabs that have an ultraviolet (UV)-sensitive visual pigment in addition to blue-sensitive ones. This suggests that UV sensitivity plays an important role in their ecology, and this sensitivity may also permit them to see as-yet undiscovered short wavelength bioluminescence from other bottom-dwelling organisms. UV bioluminescence on the deep ocean floor may be a novel, private channel of communication, allowing these animals to find their preferred habitat.
“Without damaging or endangering these fascinating creatures, we will be photographing them from the Johnson-Sea-Link with all of the lights off using a special camera with a very wide aperture, as well as with ORCA’s Eye-in-the-Sea camera system that uses a very low light sensitive video camera. This should allow us to record bioluminescence which we are unable to see with the naked eye,” said Frank.
Frank is joined by her colleagues Drs. Sönke Johnsen, Duke University; Edith Widder, ORCA; Charles Messing, Nova Southeastern University Oceanographic Center; and Steve Haddock, MBARI, on this research expedition.
The two selected locations for this expedition include the western margin of the Little Bahama Bank and a location in the Northwest Providence Channel that was last studied in 1978.
The progress and discoveries made during this expedition are being chronicled on Harbor Branch’s “@Sea” website, www.at-sea.org and on NOAA’s website, www.oceanexplorer.noaa.gov.
About Harbor Branch Oceanographic Institute at FAU
Harbor Branch Oceanographic Institute at Florida Atlantic University is a research institute dedicated to exploration, innovation, conservation, and education related to the oceans. Harbor Branch was founded in 1971 as a private non-profit organization. In December 2007, Harbor Branch joined Florida Atlantic University. The institute specializes in ocean engineering, at-sea operations, drug discovery and biotechnology from the oceans, coastal ecology and conservation, marine mammal research and conservation, aquaculture, and marine education. For more information, visit www.hboi.fau.edu.About Florida Atlantic University
Gisele Galoustian | Newswise Science News
Molecular Force Sensors
20.09.2017 | Max-Planck-Institut für Biochemie
Foster tadpoles trigger parental instinct in poison frogs
20.09.2017 | Veterinärmedizinische Universität Wien
Whispering gallery mode (WGM) resonators are used to make tiny micro-lasers, sensors, switches, routers and other devices. These tiny structures rely on a...
Using ultrafast flashes of laser and x-ray radiation, scientists at the Max Planck Institute of Quantum Optics (Garching, Germany) took snapshots of the briefest electron motion inside a solid material to date. The electron motion lasted only 750 billionths of the billionth of a second before it fainted, setting a new record of human capability to capture ultrafast processes inside solids!
When x-rays shine onto solid materials or large molecules, an electron is pushed away from its original place near the nucleus of the atom, leaving a hole...
For the first time, physicists have successfully imaged spiral magnetic ordering in a multiferroic material. These materials are considered highly promising candidates for future data storage media. The researchers were able to prove their findings using unique quantum sensors that were developed at Basel University and that can analyze electromagnetic fields on the nanometer scale. The results – obtained by scientists from the University of Basel’s Department of Physics, the Swiss Nanoscience Institute, the University of Montpellier and several laboratories from University Paris-Saclay – were recently published in the journal Nature.
Multiferroics are materials that simultaneously react to electric and magnetic fields. These two properties are rarely found together, and their combined...
MBM ScienceBridge GmbH successfully negotiated a license agreement between University Medical Center Göttingen (UMG) and the biotech company Tissue Systems Holding GmbH about commercial use of a multi-well tissue plate for automated and reliable tissue engineering & drug testing.
MBM ScienceBridge GmbH successfully negotiated a license agreement between University Medical Center Göttingen (UMG) and the biotech company Tissue Systems...
Pathogenic bacteria are becoming resistant to common antibiotics to an ever increasing degree. One of the most difficult germs is Pseudomonas aeruginosa, a...
19.09.2017 | Event News
12.09.2017 | Event News
06.09.2017 | Event News
20.09.2017 | Life Sciences
20.09.2017 | Power and Electrical Engineering
20.09.2017 | Physics and Astronomy